Chain-drum rossing device



May 17, 1955 D. J. LANTZ CHAIN-DRUM ROSSING DEVICE 2 Sheets-Sheet Filed June 14, 1954 JT g- ATTORNEY May 17, 1955 D. .1. LANTZ 2 Sheets-Sheet 2 ATTORNEY United States Patent CHAIN-DRUM ROSSING DEVICE Durell J. Lantz, Sundance, Wyo. Application June 14, 1954, Serial No. 436,678

1 Claim. (Cl. 144-208) The present invention relates to improvements in machines for removing bark from logs, posts, or timber, and for rossing the bark thereof. The purpose of the invention is to provide a device, usable as an attachment for existing portable chain saws, which can be readily attached to and removed from a chain saw, thereby converting the same to a portable bark rosser powered by the conventional power plant of such existing chain saws, and the principal function and object of which is to utilize the chain saw teeth in combination with rasp-type or planer-type drums to provide a total rossing surface, and which rasp-type drums are center-driven by means of such chain.

Reference is made to the accompanying drawings, wherein like reference numbers designate corresponding parts throughout the several views, and wherein:

Figure 1 is a perspective view of a chain saw with the roossing device attached;

Figure 2 is a side view of a chain saw blade with idler sprocket wheel mounted therein;

Figure 3 is a central cross section of the rasp-type drums and idler sprocket wheel, with common shaft, as taken on an inclined plane indicated by the line 3--3 of Figure 1; and

Figure 4 is a plan view of the rasp-type drums, showing part of the saw chain in position over the idler sprocket Wheel.

It is to be noted that the blade, chain, and mounted rasp-type drums constitute the entire attachment, as dlstinguished from the drums and mountings therefor; so that in converting a chain saw to a rosser, the entlre blade and chain assembly normally used in cutting timber would be removed, and a different blade, with chain, mountings, and drums, would be attached to the power unit.

The function of the device as a rosser is as follows: Power from the power unit of a chain saw motor 1 drives a saw chain 2 in a forward motion away from the motor and along the top of a blade 3, such power and motion being transmitted to the chain through the medium of a driving sprocket wheel not shown. At the outer end of the blade 3, links 17 of the chain 2 pass over an idler sprocket wheel 5, suitably recessed as at 18 for reception of inner chain teeth 16, thereby turning the idler sprocket wheel 5 in the same direction as the chain 2. The idler sprocket wheel 5 is mounted on a shaft 6 which is held in juxtaposition by mounts 4 attached to the blade 3 substantially as shown in Figure 2, and which shaft 6 is turned directly and positively by and with the idler sprocket wheel 5 by means of a suitable key 7. Lubrication of bearings 8, contained in the mounts 4 and within which the shaft 6 turns, is by any suitable means as at 9. Detachably fixed on the shaft 6, by nuts 10, one on each side of the idler sprocket wheel 5, is a rasp-type drum 11, which is keyed to the shaft 6 by means of a suitable key 12 so as to turn therewith. The assembled device is shown in Figure l. Tolerance between each drum 11 and the saw chain 2 as it passes onto, over, and from the idler sprocket wheel 5 is maintained by shoulders 15 on the shaft 6, against which the drums 11 may be drawn tightly by the nuts 10, as shown in Figure 3. The idler sprocket wheel 5 is designed as shown in Figure 3, the recesses 18 being flanged for lateral retention of the inner teeth 16 of the chain 2 as the latter passes thereover, and for the further purpose of maintaining the necessary tolerance between the chain cutting teeth 17 and the drums 11; such recesses 18 in the sprocket wheel 5 performing a similar chain-guiding function as channel 19 along the top and bottom of the blade 3.

The rasp-type drums 11 may be hollow, in which case they are provided with end wall openings 13 to permit air cooling thereof. Any suitable scoring members, such as rasping teeth 14 which are shown integral with the drums, may be employed. The general shape of each of the drums 11 is preferably that of a concave frustum, as shown in Figures 1, 3, and 4, for purposes of substantial conformity with the circumference of the post or log being rossed, when applied along the length thereof as shown in Figure 1. An inner end wall of each drum 11 corresponds to the small end of the concave frustum and has a diameter substantially equal to the diameter of an arcuate profile formed by the saw chain 2 as it passes over the idler sprocket wheel 5.

In operation, as heretofore stated, the rasping surface of each of the drums 11, being comprised of the teeth 14 or other scoring members, in conjunction with the cutting width of the saw chain teeth 17 between such drums 11, turning in a forward motion along the top thereof and away from the operator, applied along the length of a post or log, will provide a complete rossing function along a lineal strip of such log or post, the width of such lineal strip being determined by the amount of conformity with the shape of the post or log achieved by the use of different sizes or shapes of drums 11. For uniformity of rossing, so as to avoid a gouging into the body of the post or log, suitable guides may be attached to the mounts 4, upon which the weight of the unit would ride when the rasping effect acquired the appropriate depth, and which would thereby limit the depth of such rasping effect, depending upon the angle at which the rossing device is applied to the post or log. No such guides are shown in the drawings for the reason that the same are not a part of the invention. Similarly, suitable shields (not shown) of a more or less semi-cylindrical shape may be provided, attachable as a housing over the rasping drums, for protection to the operator from flying particles and shavings.

While the present invention is designed primarily for use as an attachment for portable chain saws, and to be used lineally along the post or log being rossed, it will be apparent that changes may be made by those skilled in the art with respect to the shape of the rasp-type drums, or with respect to the shape or construction of the rasping or scoring members thereon, or with respect to the manner of use as a fixed or portable device, or in rossing around or across a post or log rather than lineally thereon; yet the intent of this invention is that the principal features herein exemplified are the essential embodiment of the invention, and that the same are capable of modification without departure from the function and scope of this invention.

What is claimed is:

For chain saws comprising a power unit, blade, and saw chain, an interchangeable attachment comprising a blade, a saw chain, an idler sprocket and a shaft, the idler sprocket wheel being afiixed to the shaft and mounted 4 References Cited in the file of this patent UNITED STATES PATENTS 2,526,131 Hamish et a1 Oct. 17, 1950 2,676,628 Hastain Apr. 27, 1954 FOREIGN PATENTS 676,421 France Nov. 28, 1929 

